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lib/dynamic_debug.c
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/* * lib/dynamic_debug.c * * make pr_debug()/dev_dbg() calls runtime configurable based upon their * source module. * * Copyright (C) 2008 Jason Baron <jbaron@redhat.com> * By Greg Banks <gnb@melbourne.sgi.com> * Copyright (c) 2008 Silicon Graphics Inc. All Rights Reserved. |
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* Copyright (C) 2011 Bart Van Assche. All Rights Reserved. |
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* Copyright (C) 2013 Du, Changbin <changbin.du@gmail.com> |
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*/ |
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#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ |
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#include <linux/kernel.h> #include <linux/module.h> |
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#include <linux/moduleparam.h> #include <linux/kallsyms.h> #include <linux/types.h> |
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#include <linux/mutex.h> |
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#include <linux/proc_fs.h> |
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#include <linux/seq_file.h> |
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#include <linux/list.h> #include <linux/sysctl.h> |
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#include <linux/ctype.h> |
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#include <linux/string.h> |
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#include <linux/parser.h> |
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#include <linux/string_helpers.h> |
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#include <linux/uaccess.h> |
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#include <linux/dynamic_debug.h> #include <linux/debugfs.h> |
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#include <linux/slab.h> |
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#include <linux/jump_label.h> |
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#include <linux/hardirq.h> |
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#include <linux/sched.h> |
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#include <linux/device.h> |
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#include <linux/netdevice.h> |
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extern struct _ddebug __start___verbose[]; extern struct _ddebug __stop___verbose[]; |
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struct ddebug_table { struct list_head link; |
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const char *mod_name; |
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unsigned int num_ddebugs; |
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struct _ddebug *ddebugs; }; struct ddebug_query { const char *filename; const char *module; const char *function; const char *format; unsigned int first_lineno, last_lineno; }; struct ddebug_iter { struct ddebug_table *table; unsigned int idx; }; static DEFINE_MUTEX(ddebug_lock); static LIST_HEAD(ddebug_tables); |
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static int verbose; |
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module_param(verbose, int, 0644); |
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|
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/* Return the path relative to source root */ static inline const char *trim_prefix(const char *path) { int skip = strlen(__FILE__) - strlen("lib/dynamic_debug.c"); if (strncmp(path, __FILE__, skip)) skip = 0; /* prefix mismatch, don't skip */ return path + skip; } |
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static struct { unsigned flag:8; char opt_char; } opt_array[] = { { _DPRINTK_FLAGS_PRINT, 'p' }, { _DPRINTK_FLAGS_INCL_MODNAME, 'm' }, { _DPRINTK_FLAGS_INCL_FUNCNAME, 'f' }, { _DPRINTK_FLAGS_INCL_LINENO, 'l' }, { _DPRINTK_FLAGS_INCL_TID, 't' }, |
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{ _DPRINTK_FLAGS_NONE, '_' }, |
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}; |
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/* format a string into buf[] which describes the _ddebug's flags */ static char *ddebug_describe_flags(struct _ddebug *dp, char *buf, size_t maxlen) { char *p = buf; |
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int i; |
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|
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BUG_ON(maxlen < 6); |
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for (i = 0; i < ARRAY_SIZE(opt_array); ++i) if (dp->flags & opt_array[i].flag) *p++ = opt_array[i].opt_char; |
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if (p == buf) |
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*p++ = '_'; |
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*p = '\0'; return buf; } |
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#define vpr_info(fmt, ...) \ |
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do { \ |
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if (verbose) \ pr_info(fmt, ##__VA_ARGS__); \ |
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} while (0) |
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static void vpr_info_dq(const struct ddebug_query *query, const char *msg) { /* trim any trailing newlines */ int fmtlen = 0; if (query->format) { fmtlen = strlen(query->format); while (fmtlen && query->format[fmtlen - 1] == ' ') fmtlen--; } vpr_info("%s: func=\"%s\" file=\"%s\" module=\"%s\" format=\"%.*s\" lineno=%u-%u ", msg, query->function ? query->function : "", query->filename ? query->filename : "", query->module ? query->module : "", fmtlen, query->format ? query->format : "", query->first_lineno, query->last_lineno); } |
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/* |
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* Search the tables for _ddebug's which match the given `query' and * apply the `flags' and `mask' to them. Returns number of matching * callsites, normally the same as number of changes. If verbose, * logs the changes. Takes ddebug_lock. |
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*/ |
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static int ddebug_change(const struct ddebug_query *query, unsigned int flags, unsigned int mask) |
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{ int i; struct ddebug_table *dt; unsigned int newflags; unsigned int nfound = 0; |
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char flagbuf[10]; |
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/* search for matching ddebugs */ mutex_lock(&ddebug_lock); list_for_each_entry(dt, &ddebug_tables, link) { /* match against the module name */ |
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if (query->module && !match_wildcard(query->module, dt->mod_name)) |
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continue; |
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for (i = 0; i < dt->num_ddebugs; i++) { |
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struct _ddebug *dp = &dt->ddebugs[i]; /* match against the source filename */ |
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if (query->filename && |
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!match_wildcard(query->filename, dp->filename) && !match_wildcard(query->filename, kbasename(dp->filename)) && !match_wildcard(query->filename, trim_prefix(dp->filename))) |
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continue; /* match against the function */ |
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if (query->function && |
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!match_wildcard(query->function, dp->function)) |
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continue; /* match against the format */ |
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if (query->format && !strstr(dp->format, query->format)) |
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continue; /* match against the line number range */ if (query->first_lineno && dp->lineno < query->first_lineno) continue; if (query->last_lineno && dp->lineno > query->last_lineno) continue; nfound++; newflags = (dp->flags & mask) | flags; if (newflags == dp->flags) continue; |
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#ifdef HAVE_JUMP_LABEL if (dp->flags & _DPRINTK_FLAGS_PRINT) { if (!(flags & _DPRINTK_FLAGS_PRINT)) static_branch_disable(&dp->key.dd_key_true); } else if (flags & _DPRINTK_FLAGS_PRINT) static_branch_enable(&dp->key.dd_key_true); #endif |
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dp->flags = newflags; |
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vpr_info("changed %s:%d [%s]%s =%s ", |
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trim_prefix(dp->filename), dp->lineno, dt->mod_name, dp->function, ddebug_describe_flags(dp, flagbuf, sizeof(flagbuf))); |
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} } mutex_unlock(&ddebug_lock); if (!nfound && verbose) |
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pr_info("no matches for query "); |
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return nfound; |
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} /* |
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* Split the buffer `buf' into space-separated words. |
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* Handles simple " and ' quoting, i.e. without nested, * embedded or escaped \". Return the number of words * or <0 on error. |
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*/ static int ddebug_tokenize(char *buf, char *words[], int maxwords) { int nwords = 0; |
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while (*buf) { char *end; /* Skip leading whitespace */ |
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buf = skip_spaces(buf); |
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if (!*buf) break; /* oh, it was trailing whitespace */ |
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if (*buf == '#') break; /* token starts comment, skip rest of line */ |
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|
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/* find `end' of word, whitespace separated or quoted */ |
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if (*buf == '"' || *buf == '\'') { int quote = *buf++; |
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for (end = buf; *end && *end != quote; end++) |
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; |
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if (!*end) { pr_err("unclosed quote: %s ", buf); |
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return -EINVAL; /* unclosed quote */ |
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} |
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} else { |
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for (end = buf; *end && !isspace(*end); end++) |
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; BUG_ON(end == buf); } |
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|
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/* `buf' is start of word, `end' is one past its end */ |
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if (nwords == maxwords) { pr_err("too many words, legal max <=%d ", maxwords); |
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return -EINVAL; /* ran out of words[] before bytes */ |
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} |
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if (*end) *end++ = '\0'; /* terminate the word */ words[nwords++] = buf; buf = end; } |
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if (verbose) { int i; |
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pr_info("split into words:"); |
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for (i = 0; i < nwords; i++) |
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pr_cont(" \"%s\"", words[i]); pr_cont(" "); |
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} return nwords; } /* * Parse a single line number. Note that the empty string "" * is treated as a special case and converted to zero, which * is later treated as a "don't care" value. */ static inline int parse_lineno(const char *str, unsigned int *val) { |
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BUG_ON(str == NULL); if (*str == '\0') { *val = 0; return 0; } |
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if (kstrtouint(str, 10, val) < 0) { |
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pr_err("bad line-number: %s ", str); return -EINVAL; } return 0; |
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} |
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static int check_set(const char **dest, char *src, char *name) { int rc = 0; if (*dest) { rc = -EINVAL; |
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pr_err("match-spec:%s val:%s overridden by %s ", name, *dest, src); |
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} *dest = src; return rc; } |
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/* * Parse words[] as a ddebug query specification, which is a series * of (keyword, value) pairs chosen from these possibilities: * * func <function-name> * file <full-pathname> * file <base-filename> * module <module-name> * format <escaped-string-to-find-in-format> * line <lineno> * line <first-lineno>-<last-lineno> // where either may be empty |
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* * Only 1 of each type is allowed. * Returns 0 on success, <0 on error. |
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*/ static int ddebug_parse_query(char *words[], int nwords, |
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struct ddebug_query *query, const char *modname) |
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{ unsigned int i; |
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int rc = 0; |
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/* check we have an even number of words */ |
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if (nwords % 2 != 0) { pr_err("expecting pairs of match-spec <value> "); |
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return -EINVAL; |
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} |
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memset(query, 0, sizeof(*query)); |
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if (modname) /* support $modname.dyndbg=<multiple queries> */ query->module = modname; |
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for (i = 0; i < nwords; i += 2) { if (!strcmp(words[i], "func")) { |
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rc = check_set(&query->function, words[i+1], "func"); |
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} else if (!strcmp(words[i], "file")) { |
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rc = check_set(&query->filename, words[i+1], "file"); |
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} else if (!strcmp(words[i], "module")) { |
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rc = check_set(&query->module, words[i+1], "module"); |
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} else if (!strcmp(words[i], "format")) { |
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string_unescape_inplace(words[i+1], UNESCAPE_SPACE | UNESCAPE_OCTAL | UNESCAPE_SPECIAL); rc = check_set(&query->format, words[i+1], "format"); |
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} else if (!strcmp(words[i], "line")) { |
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char *first = words[i+1]; char *last = strchr(first, '-'); |
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if (query->first_lineno || query->last_lineno) { |
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pr_err("match-spec: line used 2x "); |
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return -EINVAL; } |
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if (last) *last++ = '\0'; |
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if (parse_lineno(first, &query->first_lineno) < 0) |
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return -EINVAL; |
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if (last) { |
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/* range <first>-<last> */ |
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if (parse_lineno(last, &query->last_lineno) < 0) return -EINVAL; if (query->last_lineno < query->first_lineno) { |
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pr_err("last-line:%d < 1st-line:%d ", query->last_lineno, query->first_lineno); |
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return -EINVAL; |
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} |
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} else { query->last_lineno = query->first_lineno; } } else { |
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pr_err("unknown keyword \"%s\" ", words[i]); |
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return -EINVAL; } |
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if (rc) return rc; |
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} |
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vpr_info_dq(query, "parsed"); |
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return 0; } /* * Parse `str' as a flags specification, format [-+=][p]+. * Sets up *maskp and *flagsp to be used when changing the * flags fields of matched _ddebug's. Returns 0 on success * or <0 on error. */ static int ddebug_parse_flags(const char *str, unsigned int *flagsp, unsigned int *maskp) { unsigned flags = 0; |
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int op = '=', i; |
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switch (*str) { case '+': case '-': case '=': op = *str++; break; default: |
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pr_err("bad flag-op %c, at start of %s ", *str, str); |
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return -EINVAL; } |
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vpr_info("op='%c' ", op); |
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|
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for (; *str ; ++str) { |
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for (i = ARRAY_SIZE(opt_array) - 1; i >= 0; i--) { if (*str == opt_array[i].opt_char) { flags |= opt_array[i].flag; break; } |
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} |
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if (i < 0) { pr_err("unknown flag '%c' in \"%s\" ", *str, str); |
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return -EINVAL; |
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} |
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} |
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vpr_info("flags=0x%x ", flags); |
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/* calculate final *flagsp, *maskp according to mask and op */ switch (op) { case '=': *maskp = 0; *flagsp = flags; break; case '+': *maskp = ~0U; *flagsp = flags; break; case '-': *maskp = ~flags; *flagsp = 0; break; } |
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vpr_info("*flagsp=0x%x *maskp=0x%x ", *flagsp, *maskp); |
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return 0; } |
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static int ddebug_exec_query(char *query_string, const char *modname) |
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{ unsigned int flags = 0, mask = 0; struct ddebug_query query; #define MAXWORDS 9 |
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int nwords, nfound; |
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char *words[MAXWORDS]; nwords = ddebug_tokenize(query_string, words, MAXWORDS); |
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if (nwords <= 0) { pr_err("tokenize failed "); |
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return -EINVAL; |
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} /* check flags 1st (last arg) so query is pairs of spec,val */ if (ddebug_parse_flags(words[nwords-1], &flags, &mask)) { pr_err("flags parse failed "); |
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return -EINVAL; |
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} if (ddebug_parse_query(words, nwords-1, &query, modname)) { pr_err("query parse failed "); |
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return -EINVAL; |
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} |
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/* actually go and implement the change */ |
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nfound = ddebug_change(&query, flags, mask); |
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vpr_info_dq(&query, nfound ? "applied" : "no-match"); |
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return nfound; } /* handle multiple queries in query string, continue on error, return last error or number of matching callsites. Module name is either in param (for boot arg) or perhaps in query string. */ |
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static int ddebug_exec_queries(char *query, const char *modname) |
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{ char *split; int i, errs = 0, exitcode = 0, rc, nfound = 0; for (i = 0; query; query = split) { split = strpbrk(query, "; "); if (split) *split++ = '\0'; query = skip_spaces(query); if (!query || !*query || *query == '#') continue; |
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vpr_info("query %d: \"%s\" ", i, query); |
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|
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rc = ddebug_exec_query(query, modname); |
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497 498 499 |
if (rc < 0) { errs++; exitcode = rc; |
f657fd21e dynamic_debug: Fi... |
500 |
} else { |
85f7f6c0e dynamic_debug: pr... |
501 |
nfound += rc; |
f657fd21e dynamic_debug: Fi... |
502 |
} |
85f7f6c0e dynamic_debug: pr... |
503 504 |
i++; } |
b8ccd5dee dynamic_debug: re... |
505 506 |
vpr_info("processed %d queries, with %d matches, %d errs ", |
85f7f6c0e dynamic_debug: pr... |
507 508 509 510 511 |
i, nfound, errs); if (exitcode) return exitcode; return nfound; |
fd89cfb87 Dynamic Debug: Sp... |
512 |
} |
431625dac dynamic_debug: us... |
513 514 515 516 517 518 519 520 521 522 |
#define PREFIX_SIZE 64 static int remaining(int wrote) { if (PREFIX_SIZE - wrote > 0) return PREFIX_SIZE - wrote; return 0; } static char *dynamic_emit_prefix(const struct _ddebug *desc, char *buf) |
8ba6ebf58 Dynamic debug: Ad... |
523 |
{ |
431625dac dynamic_debug: us... |
524 525 |
int pos_after_tid; int pos = 0; |
8ba6ebf58 Dynamic debug: Ad... |
526 |
|
798efc60e dev_dbg/dynamic_d... |
527 |
*buf = '\0'; |
431625dac dynamic_debug: us... |
528 |
if (desc->flags & _DPRINTK_FLAGS_INCL_TID) { |
8ba6ebf58 Dynamic debug: Ad... |
529 |
if (in_interrupt()) |
798efc60e dev_dbg/dynamic_d... |
530 |
pos += snprintf(buf + pos, remaining(pos), "<intr> "); |
8ba6ebf58 Dynamic debug: Ad... |
531 |
else |
431625dac dynamic_debug: us... |
532 |
pos += snprintf(buf + pos, remaining(pos), "[%d] ", |
798efc60e dev_dbg/dynamic_d... |
533 |
task_pid_vnr(current)); |
8ba6ebf58 Dynamic debug: Ad... |
534 |
} |
431625dac dynamic_debug: us... |
535 536 537 |
pos_after_tid = pos; if (desc->flags & _DPRINTK_FLAGS_INCL_MODNAME) pos += snprintf(buf + pos, remaining(pos), "%s:", |
798efc60e dev_dbg/dynamic_d... |
538 |
desc->modname); |
431625dac dynamic_debug: us... |
539 540 |
if (desc->flags & _DPRINTK_FLAGS_INCL_FUNCNAME) pos += snprintf(buf + pos, remaining(pos), "%s:", |
798efc60e dev_dbg/dynamic_d... |
541 |
desc->function); |
431625dac dynamic_debug: us... |
542 |
if (desc->flags & _DPRINTK_FLAGS_INCL_LINENO) |
07100be7e dynamic_debug: fi... |
543 |
pos += snprintf(buf + pos, remaining(pos), "%d:", |
798efc60e dev_dbg/dynamic_d... |
544 |
desc->lineno); |
431625dac dynamic_debug: us... |
545 546 547 548 |
if (pos - pos_after_tid) pos += snprintf(buf + pos, remaining(pos), " "); if (pos >= PREFIX_SIZE) buf[PREFIX_SIZE - 1] = '\0'; |
6c2140ee0 dynamic_debug: Co... |
549 |
|
431625dac dynamic_debug: us... |
550 |
return buf; |
6c2140ee0 dynamic_debug: Co... |
551 |
} |
906d20153 dynamic_debug: ch... |
552 |
void __dynamic_pr_debug(struct _ddebug *descriptor, const char *fmt, ...) |
8ba6ebf58 Dynamic debug: Ad... |
553 554 |
{ va_list args; |
431625dac dynamic_debug: us... |
555 556 |
struct va_format vaf; char buf[PREFIX_SIZE]; |
8ba6ebf58 Dynamic debug: Ad... |
557 558 559 560 561 |
BUG_ON(!descriptor); BUG_ON(!fmt); va_start(args, fmt); |
798efc60e dev_dbg/dynamic_d... |
562 |
|
431625dac dynamic_debug: us... |
563 564 |
vaf.fmt = fmt; vaf.va = &args; |
798efc60e dev_dbg/dynamic_d... |
565 |
|
906d20153 dynamic_debug: ch... |
566 |
printk(KERN_DEBUG "%s%pV", dynamic_emit_prefix(descriptor, buf), &vaf); |
798efc60e dev_dbg/dynamic_d... |
567 |
|
8ba6ebf58 Dynamic debug: Ad... |
568 |
va_end(args); |
8ba6ebf58 Dynamic debug: Ad... |
569 570 |
} EXPORT_SYMBOL(__dynamic_pr_debug); |
906d20153 dynamic_debug: ch... |
571 |
void __dynamic_dev_dbg(struct _ddebug *descriptor, |
cbc466355 dynamic_debug: Ad... |
572 573 574 575 |
const struct device *dev, const char *fmt, ...) { struct va_format vaf; va_list args; |
cbc466355 dynamic_debug: Ad... |
576 577 578 579 580 |
BUG_ON(!descriptor); BUG_ON(!fmt); va_start(args, fmt); |
798efc60e dev_dbg/dynamic_d... |
581 |
|
cbc466355 dynamic_debug: Ad... |
582 583 |
vaf.fmt = fmt; vaf.va = &args; |
798efc60e dev_dbg/dynamic_d... |
584 585 |
if (!dev) { |
906d20153 dynamic_debug: ch... |
586 |
printk(KERN_DEBUG "(NULL device *): %pV", &vaf); |
798efc60e dev_dbg/dynamic_d... |
587 588 |
} else { char buf[PREFIX_SIZE]; |
798efc60e dev_dbg/dynamic_d... |
589 |
|
a39d4a857 printk: add and u... |
590 |
dev_printk_emit(LOGLEVEL_DEBUG, dev, "%s%s %s: %pV", |
906d20153 dynamic_debug: ch... |
591 592 593 |
dynamic_emit_prefix(descriptor, buf), dev_driver_string(dev), dev_name(dev), &vaf); |
798efc60e dev_dbg/dynamic_d... |
594 |
} |
cbc466355 dynamic_debug: Ad... |
595 |
va_end(args); |
cbc466355 dynamic_debug: Ad... |
596 597 |
} EXPORT_SYMBOL(__dynamic_dev_dbg); |
0feefd978 dynamic_debug: fi... |
598 |
#ifdef CONFIG_NET |
906d20153 dynamic_debug: ch... |
599 600 |
void __dynamic_netdev_dbg(struct _ddebug *descriptor, const struct net_device *dev, const char *fmt, ...) |
ffa10cb47 dynamic_debug: ma... |
601 602 603 |
{ struct va_format vaf; va_list args; |
ffa10cb47 dynamic_debug: ma... |
604 605 606 607 608 |
BUG_ON(!descriptor); BUG_ON(!fmt); va_start(args, fmt); |
b004ff497 netdev_printk/dyn... |
609 |
|
ffa10cb47 dynamic_debug: ma... |
610 611 |
vaf.fmt = fmt; vaf.va = &args; |
b004ff497 netdev_printk/dyn... |
612 613 614 |
if (dev && dev->dev.parent) { char buf[PREFIX_SIZE]; |
666f355f3 device and dynami... |
615 |
|
a39d4a857 printk: add and u... |
616 |
dev_printk_emit(LOGLEVEL_DEBUG, dev->dev.parent, |
906d20153 dynamic_debug: ch... |
617 618 619 620 621 622 |
"%s%s %s %s%s: %pV", dynamic_emit_prefix(descriptor, buf), dev_driver_string(dev->dev.parent), dev_name(dev->dev.parent), netdev_name(dev), netdev_reg_state(dev), &vaf); |
b004ff497 netdev_printk/dyn... |
623 |
} else if (dev) { |
906d20153 dynamic_debug: ch... |
624 625 |
printk(KERN_DEBUG "%s%s: %pV", netdev_name(dev), netdev_reg_state(dev), &vaf); |
b004ff497 netdev_printk/dyn... |
626 |
} else { |
906d20153 dynamic_debug: ch... |
627 |
printk(KERN_DEBUG "(NULL net_device): %pV", &vaf); |
b004ff497 netdev_printk/dyn... |
628 |
} |
ffa10cb47 dynamic_debug: ma... |
629 |
va_end(args); |
ffa10cb47 dynamic_debug: ma... |
630 631 |
} EXPORT_SYMBOL(__dynamic_netdev_dbg); |
0feefd978 dynamic_debug: fi... |
632 |
#endif |
bc757f6f5 dynamic_debug: re... |
633 634 |
#define DDEBUG_STRING_SIZE 1024 static __initdata char ddebug_setup_string[DDEBUG_STRING_SIZE]; |
a648ec05b Dynamic Debug: In... |
635 636 |
static __init int ddebug_setup_query(char *str) { |
bc757f6f5 dynamic_debug: re... |
637 |
if (strlen(str) >= DDEBUG_STRING_SIZE) { |
4ad275e5c dynamic_debug: Co... |
638 639 |
pr_warn("ddebug boot param string too large "); |
a648ec05b Dynamic Debug: In... |
640 641 |
return 0; } |
bc757f6f5 dynamic_debug: re... |
642 |
strlcpy(ddebug_setup_string, str, DDEBUG_STRING_SIZE); |
a648ec05b Dynamic Debug: In... |
643 644 645 646 |
return 1; } __setup("ddebug_query=", ddebug_setup_query); |
e9d376f0f dynamic debug: co... |
647 |
/* |
231821d4c dynamic_debug: fi... |
648 |
* File_ops->write method for <debugfs>/dynamic_debug/control. Gathers the |
e9d376f0f dynamic debug: co... |
649 650 |
* command text from userspace, parses and executes it. */ |
7281491c5 dynamic_debug: en... |
651 |
#define USER_BUF_PAGE 4096 |
e9d376f0f dynamic debug: co... |
652 653 654 |
static ssize_t ddebug_proc_write(struct file *file, const char __user *ubuf, size_t len, loff_t *offp) { |
7281491c5 dynamic_debug: en... |
655 |
char *tmpbuf; |
fd89cfb87 Dynamic Debug: Sp... |
656 |
int ret; |
e9d376f0f dynamic debug: co... |
657 658 659 |
if (len == 0) return 0; |
7281491c5 dynamic_debug: en... |
660 661 662 |
if (len > USER_BUF_PAGE - 1) { pr_warn("expected <%d bytes into control ", USER_BUF_PAGE); |
e9d376f0f dynamic debug: co... |
663 |
return -E2BIG; |
7281491c5 dynamic_debug: en... |
664 |
} |
16e5c1fc3 convert a bunch o... |
665 666 667 |
tmpbuf = memdup_user_nul(ubuf, len); if (IS_ERR(tmpbuf)) return PTR_ERR(tmpbuf); |
b8ccd5dee dynamic_debug: re... |
668 669 |
vpr_info("read %d bytes from userspace ", (int)len); |
e9d376f0f dynamic debug: co... |
670 |
|
8e59b5cfb dynamic_debug: ad... |
671 |
ret = ddebug_exec_queries(tmpbuf, NULL); |
7281491c5 dynamic_debug: en... |
672 |
kfree(tmpbuf); |
85f7f6c0e dynamic_debug: pr... |
673 |
if (ret < 0) |
fd89cfb87 Dynamic Debug: Sp... |
674 |
return ret; |
e9d376f0f dynamic debug: co... |
675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 |
*offp += len; return len; } /* * Set the iterator to point to the first _ddebug object * and return a pointer to that first object. Returns * NULL if there are no _ddebugs at all. */ static struct _ddebug *ddebug_iter_first(struct ddebug_iter *iter) { if (list_empty(&ddebug_tables)) { iter->table = NULL; iter->idx = 0; return NULL; } iter->table = list_entry(ddebug_tables.next, struct ddebug_table, link); iter->idx = 0; return &iter->table->ddebugs[iter->idx]; } /* * Advance the iterator to point to the next _ddebug * object from the one the iterator currently points at, * and returns a pointer to the new _ddebug. Returns * NULL if the iterator has seen all the _ddebugs. */ static struct _ddebug *ddebug_iter_next(struct ddebug_iter *iter) { if (iter->table == NULL) return NULL; if (++iter->idx == iter->table->num_ddebugs) { /* iterate to next table */ iter->idx = 0; if (list_is_last(&iter->table->link, &ddebug_tables)) { iter->table = NULL; return NULL; } iter->table = list_entry(iter->table->link.next, struct ddebug_table, link); } return &iter->table->ddebugs[iter->idx]; } /* * Seq_ops start method. Called at the start of every * read() call from userspace. Takes the ddebug_lock and * seeks the seq_file's iterator to the given position. */ static void *ddebug_proc_start(struct seq_file *m, loff_t *pos) { struct ddebug_iter *iter = m->private; struct _ddebug *dp; int n = *pos; |
b8ccd5dee dynamic_debug: re... |
731 732 |
vpr_info("called m=%p *pos=%lld ", m, (unsigned long long)*pos); |
e9d376f0f dynamic debug: co... |
733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 |
mutex_lock(&ddebug_lock); if (!n) return SEQ_START_TOKEN; if (n < 0) return NULL; dp = ddebug_iter_first(iter); while (dp != NULL && --n > 0) dp = ddebug_iter_next(iter); return dp; } /* * Seq_ops next method. Called several times within a read() * call from userspace, with ddebug_lock held. Walks to the * next _ddebug object with a special case for the header line. */ static void *ddebug_proc_next(struct seq_file *m, void *p, loff_t *pos) { struct ddebug_iter *iter = m->private; struct _ddebug *dp; |
b8ccd5dee dynamic_debug: re... |
755 756 |
vpr_info("called m=%p p=%p *pos=%lld ", |
f657fd21e dynamic_debug: Fi... |
757 |
m, p, (unsigned long long)*pos); |
e9d376f0f dynamic debug: co... |
758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 |
if (p == SEQ_START_TOKEN) dp = ddebug_iter_first(iter); else dp = ddebug_iter_next(iter); ++*pos; return dp; } /* * Seq_ops show method. Called several times within a read() * call from userspace, with ddebug_lock held. Formats the * current _ddebug as a single human-readable line, with a * special case for the header line. */ static int ddebug_proc_show(struct seq_file *m, void *p) { struct ddebug_iter *iter = m->private; struct _ddebug *dp = p; |
5ca7d2a6c dynamic_debug: de... |
777 |
char flagsbuf[10]; |
e9d376f0f dynamic debug: co... |
778 |
|
b8ccd5dee dynamic_debug: re... |
779 780 |
vpr_info("called m=%p p=%p ", m, p); |
e9d376f0f dynamic debug: co... |
781 782 783 |
if (p == SEQ_START_TOKEN) { seq_puts(m, |
f657fd21e dynamic_debug: Fi... |
784 785 |
"# filename:lineno [module]function flags format "); |
e9d376f0f dynamic debug: co... |
786 787 |
return 0; } |
5ca7d2a6c dynamic_debug: de... |
788 |
seq_printf(m, "%s:%u [%s]%s =%s \"", |
f657fd21e dynamic_debug: Fi... |
789 790 791 |
trim_prefix(dp->filename), dp->lineno, iter->table->mod_name, dp->function, ddebug_describe_flags(dp, flagsbuf, sizeof(flagsbuf))); |
e9d376f0f dynamic debug: co... |
792 793 794 795 796 797 798 799 800 801 802 803 804 805 |
seq_escape(m, dp->format, "\t\r \""); seq_puts(m, "\" "); return 0; } /* * Seq_ops stop method. Called at the end of each read() * call from userspace. Drops ddebug_lock. */ static void ddebug_proc_stop(struct seq_file *m, void *p) { |
b8ccd5dee dynamic_debug: re... |
806 807 |
vpr_info("called m=%p p=%p ", m, p); |
e9d376f0f dynamic debug: co... |
808 809 810 811 812 813 814 815 816 817 818 |
mutex_unlock(&ddebug_lock); } static const struct seq_operations ddebug_proc_seqops = { .start = ddebug_proc_start, .next = ddebug_proc_next, .show = ddebug_proc_show, .stop = ddebug_proc_stop }; /* |
07100be7e dynamic_debug: fi... |
819 820 821 822 823 |
* File_ops->open method for <debugfs>/dynamic_debug/control. Does * the seq_file setup dance, and also creates an iterator to walk the * _ddebugs. Note that we create a seq_file always, even for O_WRONLY * files where it's not needed, as doing so simplifies the ->release * method. |
e9d376f0f dynamic debug: co... |
824 825 826 |
*/ static int ddebug_proc_open(struct inode *inode, struct file *file) { |
b8ccd5dee dynamic_debug: re... |
827 828 |
vpr_info("called "); |
4bad78c55 lib/dynamic_debug... |
829 830 |
return seq_open_private(file, &ddebug_proc_seqops, sizeof(struct ddebug_iter)); |
e9d376f0f dynamic debug: co... |
831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 |
} static const struct file_operations ddebug_proc_fops = { .owner = THIS_MODULE, .open = ddebug_proc_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release_private, .write = ddebug_proc_write }; /* * Allocate a new ddebug_table for the given module * and add it to the global list. */ int ddebug_add_module(struct _ddebug *tab, unsigned int n, const char *name) { struct ddebug_table *dt; |
3e406b1d7 lib/dynamic_debug... |
850 |
const char *new_name; |
e9d376f0f dynamic debug: co... |
851 852 853 854 |
dt = kzalloc(sizeof(*dt), GFP_KERNEL); if (dt == NULL) return -ENOMEM; |
3e406b1d7 lib/dynamic_debug... |
855 |
new_name = kstrdup_const(name, GFP_KERNEL); |
e9d376f0f dynamic debug: co... |
856 857 858 859 860 861 |
if (new_name == NULL) { kfree(dt); return -ENOMEM; } dt->mod_name = new_name; dt->num_ddebugs = n; |
e9d376f0f dynamic debug: co... |
862 863 864 865 866 |
dt->ddebugs = tab; mutex_lock(&ddebug_lock); list_add_tail(&dt->link, &ddebug_tables); mutex_unlock(&ddebug_lock); |
b8ccd5dee dynamic_debug: re... |
867 868 |
vpr_info("%u debug prints in module %s ", n, dt->mod_name); |
e9d376f0f dynamic debug: co... |
869 870 871 |
return 0; } EXPORT_SYMBOL_GPL(ddebug_add_module); |
6ab676e96 dynamic_debug: co... |
872 873 874 |
/* helper for ddebug_dyndbg_(boot|module)_param_cb */ static int ddebug_dyndbg_param_cb(char *param, char *val, const char *modname, int on_err) |
b48420c1d dynamic_debug: ma... |
875 |
{ |
b48420c1d dynamic_debug: ma... |
876 877 878 879 |
char *sep; sep = strchr(param, '.'); if (sep) { |
6ab676e96 dynamic_debug: co... |
880 |
/* needed only for ddebug_dyndbg_boot_param_cb */ |
b48420c1d dynamic_debug: ma... |
881 882 883 884 885 |
*sep = '\0'; modname = param; param = sep + 1; } if (strcmp(param, "dyndbg")) |
6ab676e96 dynamic_debug: co... |
886 |
return on_err; /* determined by caller */ |
b48420c1d dynamic_debug: ma... |
887 |
|
8e59b5cfb dynamic_debug: ad... |
888 |
ddebug_exec_queries((val ? val : "+p"), modname); |
b48420c1d dynamic_debug: ma... |
889 890 |
return 0; /* query failure shouldnt stop module load */ } |
6ab676e96 dynamic_debug: co... |
891 892 |
/* handle both dyndbg and $module.dyndbg params at boot */ static int ddebug_dyndbg_boot_param_cb(char *param, char *val, |
ecc861705 module: add extra... |
893 |
const char *unused, void *arg) |
b48420c1d dynamic_debug: ma... |
894 |
{ |
6ab676e96 dynamic_debug: co... |
895 896 897 898 |
vpr_info("%s=\"%s\" ", param, val); return ddebug_dyndbg_param_cb(param, val, NULL, 0); } |
b48420c1d dynamic_debug: ma... |
899 |
|
6ab676e96 dynamic_debug: co... |
900 901 902 903 904 905 906 907 908 909 |
/* * modprobe foo finds foo.params in boot-args, strips "foo.", and * passes them to load_module(). This callback gets unknown params, * processes dyndbg params, rejects others. */ int ddebug_dyndbg_module_param_cb(char *param, char *val, const char *module) { vpr_info("module: %s %s=\"%s\" ", module, param, val); return ddebug_dyndbg_param_cb(param, val, module, -ENOENT); |
b48420c1d dynamic_debug: ma... |
910 |
} |
e9d376f0f dynamic debug: co... |
911 912 913 |
static void ddebug_table_free(struct ddebug_table *dt) { list_del_init(&dt->link); |
3e406b1d7 lib/dynamic_debug... |
914 |
kfree_const(dt->mod_name); |
e9d376f0f dynamic debug: co... |
915 916 917 918 919 920 921 |
kfree(dt); } /* * Called in response to a module being unloaded. Removes * any ddebug_table's which point at the module. */ |
ff49d74ad module: initializ... |
922 |
int ddebug_remove_module(const char *mod_name) |
e9d376f0f dynamic debug: co... |
923 924 925 |
{ struct ddebug_table *dt, *nextdt; int ret = -ENOENT; |
b8ccd5dee dynamic_debug: re... |
926 927 |
vpr_info("removing module \"%s\" ", mod_name); |
e9d376f0f dynamic debug: co... |
928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 |
mutex_lock(&ddebug_lock); list_for_each_entry_safe(dt, nextdt, &ddebug_tables, link) { if (!strcmp(dt->mod_name, mod_name)) { ddebug_table_free(dt); ret = 0; } } mutex_unlock(&ddebug_lock); return ret; } EXPORT_SYMBOL_GPL(ddebug_remove_module); static void ddebug_remove_all_tables(void) { mutex_lock(&ddebug_lock); while (!list_empty(&ddebug_tables)) { struct ddebug_table *dt = list_entry(ddebug_tables.next, struct ddebug_table, link); ddebug_table_free(dt); } mutex_unlock(&ddebug_lock); } |
6a5c083de Dynamic Debug: In... |
952 953 954 |
static __initdata int ddebug_init_success; static int __init dynamic_debug_init_debugfs(void) |
e9d376f0f dynamic debug: co... |
955 956 |
{ struct dentry *dir, *file; |
6a5c083de Dynamic Debug: In... |
957 958 959 |
if (!ddebug_init_success) return -ENODEV; |
e9d376f0f dynamic debug: co... |
960 961 962 963 964 965 966 967 968 969 |
dir = debugfs_create_dir("dynamic_debug", NULL); if (!dir) return -ENOMEM; file = debugfs_create_file("control", 0644, dir, NULL, &ddebug_proc_fops); if (!file) { debugfs_remove(dir); return -ENOMEM; } |
6a5c083de Dynamic Debug: In... |
970 971 972 973 974 975 976 |
return 0; } static int __init dynamic_debug_init(void) { struct _ddebug *iter, *iter_start; const char *modname = NULL; |
b48420c1d dynamic_debug: ma... |
977 |
char *cmdline; |
6a5c083de Dynamic Debug: In... |
978 |
int ret = 0; |
410769276 dynamic_debug: pr... |
979 980 |
int n = 0, entries = 0, modct = 0; int verbose_bytes = 0; |
6a5c083de Dynamic Debug: In... |
981 |
|
b5b78f838 dynamic_debug: ea... |
982 |
if (__start___verbose == __stop___verbose) { |
f657fd21e dynamic_debug: Fi... |
983 984 |
pr_warn("_ddebug table is empty in a CONFIG_DYNAMIC_DEBUG build "); |
b5b78f838 dynamic_debug: ea... |
985 986 987 988 989 990 |
return 1; } iter = __start___verbose; modname = iter->modname; iter_start = iter; for (; iter < __stop___verbose; iter++) { |
410769276 dynamic_debug: pr... |
991 992 993 |
entries++; verbose_bytes += strlen(iter->modname) + strlen(iter->function) + strlen(iter->filename) + strlen(iter->format); |
b5b78f838 dynamic_debug: ea... |
994 |
if (strcmp(modname, iter->modname)) { |
410769276 dynamic_debug: pr... |
995 |
modct++; |
b5b78f838 dynamic_debug: ea... |
996 997 |
ret = ddebug_add_module(iter_start, n, modname); if (ret) |
af442399f dynamic_debug: si... |
998 |
goto out_err; |
b5b78f838 dynamic_debug: ea... |
999 1000 1001 |
n = 0; modname = iter->modname; iter_start = iter; |
e9d376f0f dynamic debug: co... |
1002 |
} |
b5b78f838 dynamic_debug: ea... |
1003 |
n++; |
e9d376f0f dynamic debug: co... |
1004 |
} |
b5b78f838 dynamic_debug: ea... |
1005 1006 |
ret = ddebug_add_module(iter_start, n, modname); if (ret) |
af442399f dynamic_debug: si... |
1007 |
goto out_err; |
a648ec05b Dynamic Debug: In... |
1008 |
|
af442399f dynamic_debug: si... |
1009 |
ddebug_init_success = 1; |
f657fd21e dynamic_debug: Fi... |
1010 1011 1012 1013 |
vpr_info("%d modules, %d entries and %d bytes in ddebug tables, %d bytes in (readonly) verbose section ", modct, entries, (int)(modct * sizeof(struct ddebug_table)), verbose_bytes + (int)(__stop___verbose - __start___verbose)); |
af442399f dynamic_debug: si... |
1014 1015 |
/* apply ddebug_query boot param, dont unload tables on err */ |
a648ec05b Dynamic Debug: In... |
1016 |
if (ddebug_setup_string[0] != '\0') { |
f657fd21e dynamic_debug: Fi... |
1017 1018 |
pr_warn("ddebug_query param name is deprecated, change it to dyndbg "); |
8e59b5cfb dynamic_debug: ad... |
1019 |
ret = ddebug_exec_queries(ddebug_setup_string, NULL); |
85f7f6c0e dynamic_debug: pr... |
1020 |
if (ret < 0) |
f657fd21e dynamic_debug: Fi... |
1021 1022 |
pr_warn("Invalid ddebug boot param %s ", |
4ad275e5c dynamic_debug: Co... |
1023 |
ddebug_setup_string); |
a648ec05b Dynamic Debug: In... |
1024 |
else |
85f7f6c0e dynamic_debug: pr... |
1025 1026 |
pr_info("%d changes by ddebug_query ", ret); |
a648ec05b Dynamic Debug: In... |
1027 |
} |
b48420c1d dynamic_debug: ma... |
1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 |
/* now that ddebug tables are loaded, process all boot args * again to find and activate queries given in dyndbg params. * While this has already been done for known boot params, it * ignored the unknown ones (dyndbg in particular). Reusing * parse_args avoids ad-hoc parsing. This will also attempt * to activate queries for not-yet-loaded modules, which is * slightly noisy if verbose, but harmless. */ cmdline = kstrdup(saved_command_line, GFP_KERNEL); parse_args("dyndbg params", cmdline, NULL, |
ecc861705 module: add extra... |
1038 |
0, 0, 0, NULL, &ddebug_dyndbg_boot_param_cb); |
b48420c1d dynamic_debug: ma... |
1039 |
kfree(cmdline); |
af442399f dynamic_debug: si... |
1040 |
return 0; |
a648ec05b Dynamic Debug: In... |
1041 |
|
af442399f dynamic_debug: si... |
1042 1043 |
out_err: ddebug_remove_all_tables(); |
e9d376f0f dynamic debug: co... |
1044 1045 |
return 0; } |
6a5c083de Dynamic Debug: In... |
1046 |
/* Allow early initialization for boot messages via boot param */ |
3ec5652ab dynamic_debug: in... |
1047 |
early_initcall(dynamic_debug_init); |
b48420c1d dynamic_debug: ma... |
1048 |
|
6a5c083de Dynamic Debug: In... |
1049 |
/* Debugfs setup must be done later */ |
3ec5652ab dynamic_debug: in... |
1050 |
fs_initcall(dynamic_debug_init_debugfs); |